阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。
Death Valley is a land of beautiful yet dangerous extremes．Death Valley can be dangerously cold during the winter months． Storms in the mountains can produce sudden flooding on the floor of the Valley．
The air temperature during the summer has been as high as fifty- seven degrees Celsius． The sun can heat the ground so that the temperature of the rocks and soil can be as high as seventy -four degrees Celsius.
Death Valley contains evidence of several ancient volcanoes that caused huge explosions． Evidence of one of these explosions is called Ubehebe Crater． The explosion left a huge hole in the ground almost a kilometer and a half wide． In many areas of Death Valley it is easy to see where the ground has been pushed up violently by movement deep in the Earth． This movement has created unusual and beautiful rock formations． Some are red． Others are dark brown, gray, yellow or black．
